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(C) Water acts as a base when it accepts a proton $(H^+)$ from another substance.In reaction $(i)$,$H_2O$ acts as a reactant to form $H_2CO_3$,but it

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$(iii)$ only

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(C) Water acts as a base when it accepts a proton $(H^+)$ from another substance.In reaction $(i)$,$H_2O$ acts as a reactant to form $H_2CO_3$,but it is not acting as a Brønsted-Lowry base.In reaction $(ii)$,$NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^-$,water donates a proton to $NH_3$ and acts as an acid.In reaction $(iii)$,$HCl + H_2O \rightleftharpoons Cl^- + H_3O^+$,water accepts a proton from $HCl$ to form $H_3O^+$,thus acting as a base.Therefore,only reaction $(iii)$ demonstrates the basic property of water.

Considering the following reactions,which pair of reactions shows that water has basic properties?
$(i) \ CO_2 + H_2O \rightleftharpoons H_2CO_3$
$(ii) \ NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^-$
$(iii) \ HCl + H_2O \rightleftharpoons Cl^- + H_3O^+$

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Considering the following reactions,which pair of reactions shows that water has basic properties?$(i) \ CO_2 + H_2O \rightleftharpoons H_2CO_3$$(ii) \ NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^-$$(iii) \ HCl + H_2O \rightleftharpoons Cl^- + H_3O^+$